pdiff + tellsimpafter behaves differently inside function

The ''x (two single quotes) syntax means "evaluate at read time". You
probably need to use apply('repopulated,...) to evaluate at execution time.

Also, to make function F local, it isn't enough to make the variable F
local; use local(...).

        -s
On Jan 2, 2013 6:57 AM, "Nijso Beishuizen" <nijso at hotmail.com> wrote:

> Dear all,
>
> I am trying to rewrite some things using pdiff, so I first load(pdiff).
> When I then enter the code below as separate statements on the command
> line in
> maxima, tellsimpafter will work and simplify the expression to g(1).
> However,
> when I place it inside a function, it will complain, saying:
>
> tellsimpafter: pattern must not be an atom; found: h1
> #0: test()(test.mac line 6)
>
> here's the code:
>
> test() := block([expr,f,g,df,h1,F],
>   expr : diff(f(x), x)*g(y),
>   F(xx,yy) := at(expr, [x = xx,y=yy]),
>   df:diff(f(x),x),
>   h1:subst(1,x,df),
>   tellsimpafter(''h1,1),
>   print(F(1,1))
> )$
>
>
> I also tried switching off debugging stuff from a maxima function using the
> lisp function from Robert Dodier, but that didn't work, so I guess this is
> something else (btw, Robert, thanks for the fix!). Does somebody know what
> goes wrong here?
>
> Best,
> NB
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